This paper describes the principle of permanent magnetic Halbach array and the features of the corre-sponding static magnetic field,and numerically analyzes the static magnetic field of a miniaturized cylindrical Hal-bach array using for nuclear magnetic resonance with the Maxwell software.First,comparative analysis is conductedfor the magnetic induction intensities of the cylindrical Halbach array under ideal conditions with different parame-ters,such as the number of discrete magnetic blocks,the type of magnetic material and the size of magnetic blocks.Then,a comparison of the results in ideal conditions is made with those in non- ideal conditions with a magnetizationdirection error or a magnetic property error of magnetic block.Finally,a comparison is also made between Halbacharray and the conventional H- style permanent magnet.The results show that (1) the number of magnetic blocks,the magnetic material and the size of magnetic blocks are the main factors affecting the magnetic induction intensityof Halbach array; (2) the manufacturing technology,such as the selection of magnetic blocks and the magnetiza-tion,significantly affects the homogeneity of magnetic field; and (3) Halbach array is superior to the conventionalpermanent magnet in terms of material adoption and generated magnetic induction intensity.